Lens mechanism for photographic apparatus



14, w Z pp LENS MECHANISM FOR PHOTOGRAPHIC APPARATUS Filed Dec. 6, 1957 lens or a part thereof is mounted in a part of wheel 4 ensures a correct engagement of the 6 transmitting members-thus. reducing the play disc 1, enables a further reduction of the climen-- 15 40 ear wheell is formedon the holder lithe teeth -.androtatably. mounted .in said casing; and a 7 i has a central cylindrical, stud. 6a to which-a of bevel gear teeth arrangedon said holder on- .50 a which is rotatably-journalled in the casin 2 'axial-pitch as that of said screw thread,'a bevel 6 reamed reaieiaee a .4 7

."UNITED STATES PATENT OFFICE 2,147,567 a 4 LENS MECHANISM FOR rnoroeitarmc v ,APPARATUS Walter Zapp, Riga, Latvia, assignor to Valsts Elektrotechniska Fabrika', Riga, Latvia, a company' of Latvia Application December '6, 1937, Serial No) 178,391

' In Finland December 24, 1936 -2 Claims. (Cl. 95-45 3 The present'invention relates to a distance setan advantage especially in view of the fact. that ting mechanism for lenses in photographic appathe handle-5 cooperates with a graduation for ratus and more particularly to such setting mech-' setting the lens for difierent distances. .The helianismsin which an annular member holding the cal arrangement of the teeth of the bevel gear the casing of 'the apparatus by means of an exbevel g'earsl, 6 in all positions of the holder, when .ternal screw threadand is movablein said-part said holder is screwed inwards or outwards (:0 ol the casing bymeans of a handle (a, disc, a set the lens -;or lenses to different-distances 'fiom' knob or the like).rotata ble on an axis perpendicuthe film,;in dependence on the distance fromthe v l lar to the axis or the lens a a 1 ph o phic apparatus to :the obie to be 0 Y The main object of the present inventionis photographed. to construct setting mechanisms'of said type I The transmitting mechanism describedis of a in such manner that the motion of the handle very compact eonstructionbut -the provision of a will be transmitted to the lens viaa minimum of studon the wheel 6 servingas a journal for the or back-lash." sions of the photographic apparatuain which Another object-is to create a compact consaid'r'nechanismis-arranged. struction ofsaid mechanism for .using such mech '.The mechanism described is especiallyfadapted' anisms in'photographic apparatus of vest pocket to 'beiused in combination with: the. devices desize. y scribed in my co-pending patent applications 20 Another object of this :invention is to create Serial Nos. 178,389, 178,388 and 178,390, respecta siinple and reliable mechanismfor the purpose ivels' entitled Improvements'in photographicapdescribed. I r 1 paratus, Improvements in'fllm'feeding mecha One embodiment'of the invention is shown in nisms for photographic apparatus, and Imthe annexeddrawing. provements inpackages'for roll film, and filed at Fig. l is a vertical section through the mecha- .thesame date as my present application; Some nism according tothe present invention. 1 features claimed in said prior applications are Fig. 2 is a plan of the same, partially in hor,i. I also Shown fic b'ed in the p cs fi p k zontalsec'tion'through the lens, that is afsectioni tion. at right angles to that-shown in Fig. ,1. WhatI claimtis: a v r 3 Fig. 3 is a vertical section showing the-mechal. A setting mechanism-tor the lens in photo'- 7 nism perspectively.- graphic apparatus, comprising in combination, The objective or lens 9, which may consist of an annular lens holder, an external screw thread a single lens, or aeomplex lens systeimis mounted on said holder by means of'which it is screwed in aholder I havinga lens holding sock'etila, "into the casing of the photographic apparatus, 5 and bore II for passage of 'lightfromthe lens a row of bevel gear teetharranged on said holdersystem. This holder has an exterial screw thread on a helical line, said helical line having the same; i 3 engaginga thread in a stationary part 2 'of the axial-pitch as that .of said screw thread, a bevel casing of thephotographic apparatus. 1 A bevel gear wheel in engagement with' said row of teeth of said wheel being arranged on .a helical line .hand'le rigidly attached to said bevel gearwhel havingthe same axial pitch as that of said-screw for adjusting th v thread 3. The'wheel'l meshes with a secondbevel -2.'A setting mechanism for the lens in photogear wheel E "of normalconstruction 'which 15 graphic, apparatus comprising, in combination, an rotatably mounted-zupon' a journal 20. forming annular lens holder; an external screw thread on part or the casing 2 and extendingin a direction said holder by means of which it is screwed into Perpendicular to the am ofthe lens. The wheel the a in f theph c aphic appara us. a r w.

disc-shaped handle 5 is attached. Upon. the stud 'a helical line, said helical line -havingthe same.

".01 the apparatus a disc I for counting the iegear wheel in engagement'with s'aid row of teethtures'exposed is rotatably mounted. 5 androtatably mounted in said casing, a cylinr When the handle 5-is turned motion'is dricalicentral-stud on said bevelgear wheel, a

to the holder land'thistransmis handle attached to said stud forrotating as aion has tubs-humus no back-lash due mule.- gear wheel, and a picture counting disc-wtatably 7 M Ila, I are rigidly intercon- ..mounted on said stud. 

